Who arranged the periodic table and predicted the existence of undiscovered elements?
Periodic Table & Periodic Trends Unit Review

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Chemistry
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9th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
Dmitri Mendeleev.
2.
FLASHCARD QUESTION
Front
What happens to the reactivity of alkali metals as you move down the group?
Back
Reactivity increases.
3.
FLASHCARD QUESTION
Front
How many valence electrons do group 17 elements have?
Back
7 valence electrons.
4.
FLASHCARD QUESTION
Front
What does each period in the periodic table correspond to?
Back
Energy levels.
5.
FLASHCARD QUESTION
Front
What are isotopes?
Back
Isotopes are atoms of the same element that have different numbers of neutrons.
6.
FLASHCARD QUESTION
Front
What is the periodic law?
Back
The periodic law states that the properties of elements are a periodic function of their atomic numbers.
7.
FLASHCARD QUESTION
Front
What is the significance of the periodic table?
Back
The periodic table organizes elements based on their properties and helps predict their behavior.
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